Pickup seats and Suburban front seats are the same. But not K5 seats.
I'd double/triple check on that before you go investing money on seats. I distinctly remember an article about some Suburbans having a weird hump that the seats mount to (meaning seats are not interchangeable). I don't recall if it's specific years or not. I'll see if I can find the article and post it here...
I would like to do a headache rack with a rack for my spare on my duramax if I can make one that looks good.